code: def _get_args(self):
      args = super()._get_args()
      new_args = dict(
          model="transformer/polyencoder",
          n_layers=1,
          n_heads=4,
          ffn_size=32,
      )
      for k, v in new_args.items():
          args[k] = v
      return args
  
imports: import os
  import pytest
  import unittest
  import parlai.utils.testing
  from parlai.tasks.integration_tests.agents import CandidateTeacher
label_desc: Use image node_id 1 for calling the TestPolyRanker obj's underlying member method code with example usage: obj._get_args() and returns: args